php Warnings in Debug Mode

When Debug is turned on i get these warnigs in the backend. Any Idea what to do about that?

Notice: Trying to access array offset on value of type bool in /www/htdocs/w01818ab/battle.vanbruda.de/wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-group-functions.php on line 58

Notice: Trying to access array offset on value of type bool in /www/htdocs/w01818ab/battle.vanbruda.de/wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-group-functions.php on line 59

Notice: Trying to access array offset on value of type bool in /www/htdocs/w01818ab/battle.vanbruda.de/wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-group-functions.php on line 59

Notice: Trying to access array offset on value of type bool in /www/htdocs/w01818ab/battle.vanbruda.de/wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-group-functions.php on line 439

Warning: Cannot modify header information – headers already sent by (output started at /www/htdocs/w01818ab/battle.vanbruda.de/wp-content/plugins/advanced-custom-fields-pro/includes/acf-field-group-functions.php:58) in /www/htdocs/w01818ab/battle.vanbruda.de/wp-admin/admin-header.php on line 9